Lithographic-printing press.



No. 637,568. Patented Nov. 2|, |899.

E. HETT.

LITHOGRAPHIC PRINTING PRESS.

(Application led .Tuna 1, 1896.) (No Model.)

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No. 637,568. Patented Nov. 2|, |899. HETT. 4 L|THUGRAPH|C PRINTING PRESS.

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ATTORNEYJ No. 637,568. Patented Nov. 2|, |899. E. HETT.

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(No Model.)

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E.HETT.

LITHOGRAPHIG PRINTING PRESS.

' (Application led Jun 1, 1896.) (No Model.) I8 Sheets-Sheet I3.

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No. 637,568. Patented Nov.` 2|, |899.

E. HETT.

LITHOGRAPHIC PRINTING PRESS.

(Application led June` 1, 1896.). (No Model.) I8 Sheets-Sheet l5,

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LITHOfnlAPHIC PRINTING PRESS.

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ATTORN EY`` Nirnn STATES- EDWARD HEIT, O F NEW YORK, N. Y.

Ll THOGRAPH|C-PR|NTING PRESS.

`S13E(lIlE `I[C.A'.[IO1\T forming part of Letters Patent No. 637,568, dated November 21, 1899. Application led June l, 1896. Serial No. 593,796. (No model.)

To caf/ZZ whom t may concern:

Beit known that I, EDWARD HETT, a citizen of the United 'States, residingat New York, (New Dorp,) in the county of Richmond, State of New York, have invented certain new and useful Improvements in Lithographie-Printing Presses, of which the following is a specication.-

The present invention has reference to printing-presses, and especially to multicolor lithographie printing presses employing a central im pression-drum and a series of surrounding cylindrical printing-surfaces and series of inking and dampening mechanisms, with ink and Water supply systems.

It has for its special object to secure and perfect the realization of multicolor lithographic printing and to supplement and to carry out to a practical and successful conclusion the methods and inventions heretofore devised by me to that end.

It consists of the mechanisms and combinations herein set out that are novel and patentable. y

In a pending application-to wit, Serial No. 695,281, filed by me November 2, 1898`I have set out at large and claimed the improvements in general method that I have devised in the art of printing, and as the present invention is subordinate thereto and addressed to one of the branches thereof and assumes for its practical success some of the earlier stages thereof I will here, besides referring to said application, briefly set out in outline the said improvements in method as introductory to a description of the present invention.

Heretofore in the art of producing bylithography pictures that have a large plurality of colors the effort and practice have been to produce the picture with as few impressions (in number) as possible, and hence with as few colors as possible, and to that end the practice of the lithographie artist has been to select as his colors a relatively small number of such basic or primary colors as by their combinations in the printing will give a fair approximation to the colors of the picture to be reproduced, and then to painstakingly proc'ced to so d raw the series of color-stones for vthese prim ary or basic colors asto cause them to repeat or overlay their respective colors upon one another in layer upon layer, thus attaining approximately the different distinct colors of the picture by' blendings and repetitions achieved in the printing, and then to print separately the dierent primary or basic colors at intervals of time allowing thorough and complete drying between printings. The eort 4and practice have been to reduce the number of primary or basic colors to a minimum, for each additional color employed has ordinarily meant another handling through the press of the entire edition printed, and to that end the effort and practice have been to increase the repetitions and overlayings of colors to a maximum. In ordinary litho` graphic Work it is consequently the practice to introduce the primary or basic colors to a greater or less extent-that is, in. fuller or lighter tints,controlled by the fullness o'r lightness of the drawing-in almost every part of the picture, almost all of the separate distinct colors of the picture being produced byalarge plurality of repetitions or overlayings of the dierent primary or basic colors employed. This principle or practice of attaining the separate distinct colors of a picture by compounding, as it were, different primary or basic colors in the printing requires that the printing of the diiferent primary or basic colors be done not in approximately instantaneous succession, but with drying intervals between, for it is a well-known fact that Whereas the first color printed on paper will dry practicallyinstantaneously, and so with a second color printed over the first, and so, indeed, with four colors printed one over the other, still four marks the limit, approximately, of practically instantaneous drying, and each subsequent color printed over the preceding four or more colors will dry only comparatively slowly, and so after each such subsequent printing or repetition a substantial drying interval must be allowed between printings. This drying interval is incidentally provided in the ordinary and usual method of lithographie printing, where one color is printed at a time, and the entire edition or a substantial part of it passes through the press for one color before it passes through the press for a subsequent color. Heretofore also it has been the practice in the art of lithography, in preparing the printing-sur- IOO Aof each transfer in the printing-press itself 2 crimesY ries of color stones or surfaces that have beeii prepared by the artist to a seriesl of printing-surfaces in accurate and related register throughout the series that the position of each transfer ofthe series on its printing-surface -has a rdefinite and accurate relation to the position of every othertransfer of the series on before beginning the printing by adjusting the printing-surface or the press, or-both, un-` til its transfer registers with the alreadyprinted impressions on the sheets'asthey are every other printing-surface of the series, and

I print from these printing-surfaces in any desired succession and accurately in register according to the denite and accurate relationto each other of the positions of the transfed in and to'painstakingly` feed sheet after ters on the several printing-surfaces attained sheet or the ed1t1on accurately to that register and so that the new impression registers with the preceding impressions. rIhus the whole burden of attaining accurate registry.V has been thrown on the printing-department.

Heretofore also it4 has been -the common practice in lithography, as stated above, to print 'the' successive colors not inV approximately instantaneous succession-as, for instance, in one and the saine press at one and the-same time-but one impression or color at a time, with substantial intervals of hours or, perhaps, of days between the printing of one color andthe printing of the next color. My improvements in the art reverse the present practice in almost all of its leading and important features. Instead of building up theseparate distinct colors of a picture 'by starting with a minimum of different basic colors and compounding them in and by the printing through a maximum of repetitions or overlayin gs achieved in the drawings, I attain the separate distinct colors of the picture to be produced, or substantially all of them, by separately mixing each of said separate distinct colors apart from and priori to the printing andas accurately as desired, preparing a large plurality of separate 'color-A printing surfaces, substantially as many as there are separate distinct colors in the picture/to be produced-a maximum of colors and a maximum of color-printing surfaces-"- and preparing these color-printing surfaces f for a mini-mum of repetitions or overlayings,

in no case more than will in the printing dry all of them) approximately instantaneously, 5o

and preferably only such as are required artistically, as for drawing, depth, or iinish,)l and finally printing from all of said colorprinting surfaces in any desired succession. Again, instead of so transferring the drawings for each separate color that the position of the transfer on one printing-surface has no .in the transferringdepartment. l i burden of attaining accurate registry is taken Thus the from the printing-department and is thrown onto the transferring-department, and I preferably dorthis transferring from'iiat onto rounded or cylindrical and onto continuous cylindrical surfaces. Again, instead of printing each color separatelythat is to say, with a separate handling of the paper oredition for each printing and with substantial dry- .ing intervals between printings-I print the colors for which separate printing-surfaces have been prepared in approximately-that is, substantially-instantaneous successionthat is to say, lwith but one handling of the paper or edition for the entire series of printingsand without substantial drying intervals between printings and preferably continuously and on the web. The present invention is of apparatus to successfully carry out the printing step of this general method or process, although parts of the invention have vof course wider application and more general utility.

i In carrying out the general method or process referred. to by the apparatus constituting IOO the present'invention I print the colors (for which separate printing-surfaces have been prepared) in approximately-that is, substantially-instantaneous succession-that is to say, atone printing operation and with but onehandling of the paper or edition for the entire series of printings and without substantial or ,prolonged drying intervals between printings and preferablycontinuously and on the Web and with a supplying of the colored inks from air-tight receptacles.

The accompanying drawings, forming a part of this specification, show a printingpress which embodies my present improvements.

In the drawings, lFigure l is a right-hand rio side elevation of the press, portions thereof Y actual or necessary relation to the position of the transfers on the other printing-surfaces constituting the series, but experimental-ly regulating the position of each transfer in the printing-press itself before beginning the printing by adjusting the printing-surface or the press, or both, and painstakingly feeding the sheets of paper into the press accurately sheet by sheet with reference to the particular adjustment of the printing-surface'in the press I so transfer the drawings from the sefchine, with the printing and inking and dambeing broken away to permit the illustration 4Vof other parts of the machine. Fig..2 is a lefthand side elevation of the same, portions being also broken away for a similar-purpose'. Fig. 3 is a central vertical section of the same, the section being taken transversely of the machine and looking from the left-hand side. Fig.- 4 is acentral vertical section taken longitudinally of the machine, looking from the front. Fig. 5 is a front elevation of the ina- 

